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Selected Quarterly Data (Unaudited) - Schedule of Selected Unaudited Consolidated Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Selected Quarterly Data Unaudited [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenue, net of returns and allowances | $ 20,174 | $ 21,003 | $ 20,633 | $ 23,225 | $ 23,079 | $ 28,743 | $ 21,115 | $ 27,116 | $ 85,035 | $ 100,053 | $ 83,073
Cost of sales | 11,614 | 13,153 | 12,706 | 14,205 | 14,886 | 18,560 | 12,533 | 17,156 | 51,678 | 63,135 | 51,967
Gross profit | 8,560 | 7,850 | 7,927 | 9,020 | 8,193 | 10,183 | 8,582 | 9,960 | 33,357 | 36,918 | 31,106
Selling, general and administrative | 6,126 | 5,718 | 5,793 | 6,626 | 6,225 | 6,775 | 6,319 | 6,424 | 24,263 | 25,743 | 24,727
Research, development and engineering | 743 | 746 | 713 | 866 | 821 | 582 | 778 | 675 | 3,068 | 2,856 | 2,738
Restructuring charges | 38 | 35 | 173 | 864 |  |  |  |  | 1,110 |  |
Impairment charges |  |  |  |  | 2,247 |  |  |  |  |  |
Operating income | 1,653 | 1,351 | 1,248 | 664 | (1,100) | 2,826 | 1,485 | 2,861 | 4,916 | 6,072 | 3,641
Gain on sale of other assets |  |  |  |  |  | 2,883 |  |  |  | 2,883 |
(Loss) income from equity method investment |  |  |  |  |  | 232 | 28 | (26) |  | 234 | (417)
Interest and other income (expense), net | 341 | 249 | 96 | 166 | 342 | 410 | (32) | 18 | 852 | 738 | 379
Income from continuing operations before income taxes | 1,994 | 1,600 | 1,344 | 830 | (758) | 6,351 | 1,481 | 2,853 | 5,768 | 9,927 | 3,603
Income tax provision | 1,012 | 707 | 332 | 582 | 352 | 1,372 | 420 | 1,152 | 2,633 | 3,296 | 1,409
Income from continuing operations, net of tax | 982 | 893 | 1,012 | 248 | (1,110) | 4,979 | 1,061 | 1,701 | 3,135 | 6,631 | 2,194
(Loss) income from discontinued operations, net of tax | (184) | 1,154 | (6,647) | (2,620) | (7,843) | (8) | 1,774 | 4,751 | (8,297) | (1,326) | 5,892
Net (loss) income | $ 798 | $ 2,047 | $ (5,635) | $ (2,372) | $ (8,953) | $ 4,971 | $ 2,835 | $ 6,452 | $ (5,162) | $ 5,305 | $ 8,086
Gross margin | 42.40% | 37.40% | 38.40% | 38.80% | 35.50% | 35.40% | 40.60% | 36.70% |  |  |
Operating margin | 8.20% | 6.40% | 6.00% | 2.90% | (4.80%) | 9.80% | 7.00% | 10.60% |  |  |
Income (Loss) Per Basic Share: |  |  |  |  |  |  |  |  |  |  |
Basic income (loss) per share from continuing operations | $ 0.07 | $ 0.06 | $ 0.07 | $ 0.02 | $ (0.08) | $ 0.33 | $ 0.07 | $ 0.12 | $ 0.22 | $ 0.45 | $ 0.16
Basic (loss) income per share from discontinued operations | (0.01) | 0.08 | (0.47) | (0.18) | (0.53) | 0.00 | 0.12 | 0.32 | (0.58) | (0.09) | 0.52
Net income (loss) per basic share | 0.06 | 0.14 | (0.40) | (0.16) | (0.61) | 0.33 | 0.19 | 0.44 | (0.36) | 0.36 | 0.68
Income (Loss) Per Diluted Share: |  |  |  |  |  |  |  |  |  |  |
Diluted income (loss) per share from continuing operations | 0.07 | 0.06 | 0.07 | 0.02 | (0.08) | 0.33 | 0.07 | 0.11 | 0.22 | 0.44 | 0.16
Diluted (loss) income per share from discontinued operations | (0.01) | 0.08 | (0.47) | (0.18) | (0.53) | 0.00 | 0.12 | 0.31 | (0.58) | (0.09) | 0.52
Net income (loss) per diluted share | $ 0.06 | $ 0.14 | $ (0.40) | $ (0.16) | $ (0.61) | $ 0.33 | $ 0.19 | $ 0.42 | $ (0.36) | $ 0.35 | $ 0.68
Weighted average shares outstanding - basic | 14,266 | 14,245 | 14,228 | 14,220 | 14,730 | 14,925 | 14,891 | 14,781 | 14,240 | 14,833 | 13,378
Weighted average shares outstanding - diluted | 14,304 | 14,316 | 14,258 | 14,252 | 14,730 | 15,091 | 15,154 | 15,298 | 14,275 | 15,065 | 13,501

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